how would I go about replicating a similar effect to the one shown here in photoshop? It seems sort of like a duotone effect, but I like how there is some texture and you can see the dark grey coming through the yellow dots. How did they do it?
Take a hand drawn sketch, preferebably one that has solid black lines and also some degree of shading. The shading of the drawing is where the texture is coming from. Obviously the final result is going to depend greatly on the original artwork.
Set the foreground colour to black, and the background colour to yellow.
Apply Filter > Sketch > Halftone Pattern
A levels adjustment on the result will give you areas of solid yellow without dots